diff --git a/internal/configs/sharding/testnet.go b/internal/configs/sharding/testnet.go
index 40ad771c9..7f3b4d350 100644
--- a/internal/configs/sharding/testnet.go
+++ b/internal/configs/sharding/testnet.go
@@ -22,9 +22,9 @@ const (
 	testnetVdfDifficulty = 10000 // This takes about 20s to finish the vdf
 
 	// TestNetHTTPPattern is the http pattern for testnet.
-	TestNetHTTPPattern = "https://api.s%d.os.hmny.io"
+	TestNetHTTPPattern = "https://api.s%d.tn.hmny.io"
 	// TestNetWSPattern is the websocket pattern for testnet.
-	TestNetWSPattern = "wss://ws.s%d.os.hmny.io"
+	TestNetWSPattern = "wss://ws.s%d.tn.hmny.io"
 )
 
 func (testnetSchedule) InstanceForEpoch(epoch *big.Int) Instance {